<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录表单区域(shift+alt+f格式化代码) -->
      <!-- ref就是该form的实例对象 通过这个实例对象调用form methods -->
      <el-form
        ref="LoginFormRef"
        :model="LoginForm"
        :rules="LoginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="LoginForm.username"
            prefix-icon="iconfont icon-user"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="LoginForm.password"
            prefix-icon="iconfont icon-3702mima"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮区 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单的数据绑定对象
      LoginForm: {
        username: "admin",
        password: "123456",
      },
      // 这是表单的验证规则对象
      LoginFormRules: {
          //校验规则
        username: [
          { required: true, message: "请输入登录名称", trigger: "blur" },
          { min: 3, max: 5, message: "长度在 3 到 5 个字符", trigger: "blur" }
        ],
        password: [
            { required: true, message: "请输入登录密码", trigger: "blur" },
          { min: 6, max: 15, message: "长度在 6 到 15 个字符", trigger: "blur" }
        ],
      },
    };
  },
  methods:{
      // 点击重置登录表单
      resetLoginForm(){
          this.$refs.LoginFormRef.resetFields()
      },
      login(){
          this.$refs.LoginFormRef.validate(async valid=>{     //判断valid这个布尔值，为true则验证通过，反之则验证不通过
            //   console.log(valid)
            if(!valid) return
            const {data:res}=await this.$http.post('login',this.LoginForm)//将data重命名为res   await和async还不会
            // console.log(res)
            if(res.meta.status!=200)return this.$message.error('登录失败！')
            this.$message.success('登录成功！')
            //1.将登录成功之后的token，保存到客户端的sessionStorage中
            //  1.1项目中除了登录之外的其他api接口，必须再登录之后才能访问
            //  1.2token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
            // console.log(res)
            window.sessionStorage.setItem('token',res.data.token)
            //2.通过编程式导航跳转到后台主页，路由地址是 /home
            this.$router.push('/home')
          })
      }
  }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex; //弹性
  justify-content: flex-end; //尾部对其
}
</style>